Friday, May 23, 2014

9985

9985 = 5 x 1997.

9985 is the number of hyperbolic knots with 13 crossings (A052408).

9985 is 23401 in base 8.

9985 is a number n such that n, n + 2, n + 4, n + 6, n + 8, n + 10, and n + 12 are all semiprimes (A092129).

9985 is the number of composite numbers between the largest 29-digit prime and the smallest 30-digit prime (A109936).

9985 has two representations as a sum of two squares: 9985 = 242 + 972 = 392 + 922.

9985 is the hypotenuse of two primitive Pythagorean triples: 99852 = 46562 + 88332 = 69432 + 71762.


Source: What's Special About This Number?

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